Door closing and locking device.



G. LOCKHART.

DOOR CLOSING AND LOCKING DEVICE.

APPLICATION FILED APR.30| 1914.

1 ,1 92,2 1 5. Patented July 25,1916.

2 SHEETS-SHEET l.

1% w/r/vmss IAIVENTOR A TTOR/VEY G. LOCKHART.

DOOR CLOSING AND LOCKING DEVICE.

APPLICATION FILED APR. 30. I914.

1,1 92,21 5, Patented July 25, 1916.

2 SHEETS-SHEET 2.

INVE/VTUR WITNESSES g. &, mm. WZ Z G TTURIVEY umTED STATES PATENT onnron.

GEORGE LOCKHAR'I, OF NEW YORK, N. Y.-

DOOR CLOSING AND LOCKING DEVICE.

Specification of Letters Patent.

Patented July 25, 1916.

Application filed April 30, 1914. Serial No. 835,354.

State of New York, have invented certain new and useful Improvements in Door Closing and Locking Devices, of which the following is a specification.

This device is particularly constructed for use on and in conjunction withv sliding doors of the type usually used on elevators, either as landing doors or as car doors.

Because of the numerous operations of doors of this character it becomes desirable and almost, necessary that a door closing and locking device shall be employed that is quick in its operation, strong in 1135,0911- struction, and sure and secure in returning and locking the door after the door has been opened. My device as here set forth fulfilsall of these useful requirements, and even other requirements not specified, in that it provides a positive means for returning the door to a closed position and it assures that when the door is started on its closing travel it cannot be reopened until it is fully closed. This element of safety is now recognized as a necessaryfunction in a highly eflicient device, and I have here developed it in a simple manner, a manner that, will encourage its. use on all doors where; it may be required.

The, following is what I consider the best means of carrying outthis invention and the accompanying drawingsform a part of this specification wherein: s

Figure 1. a view having numerous fractures shows my complete device in operative position, the fractures indicate that the parts so severed may be, elongated to any desirable extent. Fig. 2; is an elevation of thereturn locking'means, and shows its method of operation. Fig. 3. shows in elevations simpler locks, for use on a single leaf door. Fig. 4. shows on a large scale a ratchet arranged in connection with the operating handle show-n in Fig. 1. Fig.

'5. shows an operating means used as a substitute for the operating handle. Fig. 6. shows another operating means, wherein the handle and pivotal'support are omitted and a sliding member substituted.

Similar reference numerals indicate like parts in all figures where tl1ey1appear.

Referring to Fig. 1 at 1 and 2 I have shown the innermost edges of two leaves of a sliding door.

Each of these members is capable of a sliding motion in the directions indlcated by the arrow 3, and at 4 I have shown a wall or support which may be the side wall of a car or a convenient portion of the inclosure of an elevator shaft. It is between these parts that my device operates, and as these parts 1, 2 and 4 may be of ordinary construction I will not detail them. At

5 I have shown a pillow-block secured to the wall 4 and mounted rotatably in this block is a casting 6, having a screw-threaded perforation into which is secured a rod 7. The casting 6, is also provided with a lug 8 and pivotably secured therein is a link 9, which connects with the piston rod 10 of a door closing device, 11. The operation of the device 11 is suchthat it will cause the piston contained therein and the piston rod 10 to be depressed, thereby pulling the casting 11 into the position as indicated in the drawing.

Secured to, the innermost section of the sliding door is a guide rod 14 and slidably arranged thereon is a sliding member 15 which receives in pivotal engagement the rod 7 and another rod 16. The rod 16 is connected to the slide 15 and terminates in a casting 17,.which is pivotally supported by a block 18, secured to the outermost section 1 of the sliding door. Into the block 17 I secure anoperatinghandle 19 and it will be noted that when the outer and free end of the handle 19 is depressed the sliding member 15 will be raised, and the guide rod 14 and the. casting 6 will be rotated in the pillow-block 5. The depression of the handle 19. will be accompanied by a sliding motion of both movable sections of'the door. Due to. the shortened distance between the pil low-block 5 and the slide 18 a continued motion upward of the sliding member 15 will cause both sections 1 and 2 of the door to be brought to their fullest extent inward and toward the back wall 4. At the same time, the rotation of the'block 6 will withdraw the piston rod 10 from the cylinder 11 againstthe pressure of the spring 11 and now when the, pressure on the handle 19 is, released the spring 11' will force clownward the piston 11 with the result that the sections 1 and 2 of the door will be returned to the closed position indicated in Fig. 1. i

I have found it advantageous to provide that when the door starts on its closing motion it should be so provided and equipped that it cannot again be opened,

until it is completely closed. To accomplish this I have provided an extension 20, which may be formed integral with the sliding member 15 and in this extension I arrange a balanced and pivoted dog 21. Formed integral or secured to the brackets 22 and 23, which support the guide rod 14,

I arrange a rack 24, the upper end of which is provided with an outwardly extending and overhanging bracket 25. In its upward travel the dog is positioned as shown in Fig. 2, but when the full extent of the upward travel has been reached, the dog will be rotated inward by contact with the bracket 25, and now upon the return or downward movement of the sliding member 15, the dog 21 will ratchet into the teeth of the rack 24. Then, however, the sliding member 15 has traveled downward to its full extent the dog will ride upwardon a flat portion 26 of the rack 24 and will thereby be pushed outward to a position where it cannot engage the teeth of the rack. It will be noted in this connection that the flat portion 26, projects beyond the teeth of the rack 24c. Thus, it will force the dog outward to an extent that will insure that it will not engage the teeth on its next upward motion.

It may be desirable to obtain these func tions in a device for use upon a single sec,- tion door, and I have shown in Fig. 3 a simpler construction of certain of the elements before described. Here the slide 27 is provided with a projection 28 adapted to engage and to operate the push button 29. The guide rod 30 is in this device secured upon or adjacent to the stationary wall 31. The operation of this device will be fully understood and appreciated from the de scription of the more complicated structure shown in Figs. 1 and 2, and which will appear obvious in connection herewith, that I may use the rack 24 and dog 21, and that when so used all of the desirable functions will be present therein. In connection with this device, I have also shown a means for operating the sliding member from the outer side of the door. This means consists of a plate a, slidably engaged upon the guide rod 14 and arranged under the sliding member 27 or any similar member. Secured in the plate a is a rope Z) or any other flexible mem ber, which extends upward and through an opening in the door to terminate in a suitably arranged covered recess. The cover of the recess may be arranged flush with the outer surface of the door and may be provided with a lock so that the door securing means cannot be operated by an unauthorized person. When it is desired to operate from the exterior, the door of the recess is opened and the end of the flexible member I) is pulled to an extent to pass the slidable memthe slide 27 and bars secured thereto pass insure that immediately that the door is released it will close quickly, the spring operating only for a sufhcient time to insure that out of a directly vertical position. This spring may also be omitted if desired.

In connection with my bar lock or door securing means, I have found that it is desirable to so arrange the parts that the lock 2 may be operated from the front edge of the door so that the hand may beused upon the edge of the door to controlthe action of the door. In this regard it will be noted that it is only necessary to start the slide 15 or 27 upward to a sufficient extent to cause the bars connected therewith to assume an an gular position, at which time a continued pressure upon the front edge of the door will cause the door to become fully opened and the slide 15 to travel to the full extentof its operable motion. I have, therefore,

arranged three operating means for my looking device, each of which has its operating means arranged upon or adjacent to the I front edge of the door. Itwill be understood that these separate operating means may be used'with either of the locks shown in Figs. 1 or 3. I

In Fig.8-I have shown a handle 19, proj vided with an aperture 50 in which is pivotably arranged a catch 51, which is urged into a forward position by a spring 52. Secured to the door under the lever 19 but in the line of the catch 51 is a rack 53, shaped I -sion of the spring 52.

In Fig. 5 I have shown a device which may be used as a substitute for the operating handle 19. This consists of a rod 60 I connected into a rotatable block 17 and provided with an elbow 61 into which a second fitting or lug 63 is pivotably engaged. A

' vertical rod 64 secured in the lug 63 receives an additional lug 65 at its upper end and is 1 in turn pivotably engaged into an ear 66 formed integral with a sliding member 67. This sliding member operates upon a vertical rod 68 which is held upon the edge of the door, and when it is desirable to raise the sliding member 15 or 27 and thereby release the door, the slide 67 is depressed and the door may then be opened.

In Fig. I have shown another construction that I have found of value. This consists of a means for raising the sliding member and comprises an obliquely arranged rod 70 pivoted into the sliding member 15 and into an additional sliding member 71 which is operable upon. a guide rod 72, secured at the forward end of door. To operate this device, the obliquely arranged rod 70 which may be knurled or otherwise roughened is lifted to the desired extent and pressure being applied to the front edge of the door, the door may be readily opened.

The general operation of the lock in opening or closing a door, or in securing a door when closed, is the same regardless of the operating means employed, and parts of one device shown may be used with another or any of the devices may be used as shown and described. I have also found that other modifications may be made within the scope of the appended claims Without departing from the principle or sacrificing the advantages of my invention.

Having carefully and fully described my invention what I claim and desire to secure by Letters Patent is:

1. A device of the character described comprising a guide rod, a slide thereon, a plurality of rods pivoted thereto, a dog rotatable therein and a rack in operable relations therewith all combined for joint operations as and for the purpose set forth.

2. A device of the character described &

comprising a guide rod, a slide thereon, a plurality of rods pivoted thereto, a dog rotatable therein and a rack in operable relations therewith and provided with means at each end thereof for operating said dog all combined for joint operations as and for the purpose set forth.

3. A device of the character described having in combination a door opening and closing device, comprising a plurality of pivoted rods in approximate alinement, a means connected therewith for returning said rods to a locking position, and means for preventing the reopening of a door during its closing motion and means for disengaging said last mentioned means at the end of the closing motion, means for retaining a door in open position all combined for joint operation as herein specified.

4. A device of the character described comprising a door closing and locking means, and in combination therewith a door retaining means, said means consisting of a balanced dog and means for operating it, said dog being adapted to be returned by the extreme motion of a door in either direction as herein specified and for the purpose set forth 5. A device of the character described comprising a guide, a slide thereon, a rod pivoted to said slide, means remote from said slide for operating said slide and a rack and dog operable therewith and adapted to prevent a reverse motion thereof as herein specified.

Signed at- New York city, New York, this 23rd day of April, 1914.

GEO. LOOKHART.

Witnesses:

G. E. STERRITTE, ARTHUR PHELPS MARR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

